[JAVA][Beginning Java 8 Games Development]

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Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Figure 17-30. Create a conditional if using attackCounter inside the .update( ) method that calls initiateAttack( ) method Most of this “auto-attack” code we will be writing during this admittedly advanced chapter will leverage this .update() method, which will be called from the .handle() method that runs our game from the GamePlayLoop class. The reason I installed this .update() method that you need to override in every Actor subclass, is in case you wanted to animate things in the game. If an Actor is static, the .update() method simply exists as an empty or unused method. Attacking on Both Sides of the Screen: .initiateAttack() Method The way to make your attack come from both sides of the screen is to have a boolean variable that can be set to right (true) or left (false), which we will call takeSides. Declare this variable at the top of the Enemy class, and then create an empty private void initiateAttack(){} method structure underneath your .update() method. Inside of this .initiateAttack() method, create an empty if-else structure if(takeSides){}else{} to hold your attack programming logic, so private void initiateAttack(){if(takeSides){}else{}} if you are into writing super compact Java code (this is valid Java code, but does absolutely nothing thus far). If you follow the industry standard Java 8 code formatting practices, the Java method body that you would use to implement this empty infrastructure can be seen in Figure 17-31, and should look like the following: boolean takeSides = false; private void initiateAttack() { if(takeSides) { // Empty Statement } else { // Empty Statement } } www.it-ebooks.info 419
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Figure 17-31. Add an if-else structure inside of the initiateAttack() method, to alternate between the left and right sides Inside the if(takeSides){} structure set the Enemy object (which we named iBeagle in the InvinciBagel class) to an X location of 500, by using spriteFrame.setTranslateX(500); and to a random height on the screen, using a spriteFrame.setTranslateY() method call in conjunction with the random number generator object we installed in the previous section of the chapter. If you type in your randomNum object name and then hit the period key, you will be presented with a number of method call options, which is shown in Figure 17-32. Double-click the nextInt(int bound) option, and insert that method call off of the randomNum object inside the .setTranslateY() method. 420 www.it-ebooks.info
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Contents at a Glance About the Auth
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Introduction The Java Programming L
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■ Introduction In Chapter 13 you
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Chapter 1 ■ Setting Up a Java 8 G
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Chapter 2 Setting Up Your Java 8 ID
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Chapter 2 ■ Setting Up Your Java
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Profiling Your Java 8 Game Applicat
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Chapter 3 ■ A Java 8 Primer: An I
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Chapter 4 ■ An Introduction to Ja
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Chapter 5 An Introduction to Game D
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Chapter 5 ■ An Introduction to Ga
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Chapter 6 The Foundation of Game De
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Chapter 6 ■ The Foundation of Gam
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Chapter 8 Creating Your Actor Engin
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Chapter 8 ■ Creating Your Actor E
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Chapter 9 Controlling Your Action F
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Chapter 9 ■ Controlling Your Acti
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Chapter 10 Directing the Cast of Ac
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Chapter 10 ■ Directing the Cast o
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Chapter 11 ■ Moving Your Action F
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Chapter 12 Setting Boundaries for Y
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Chapter 13 ■ Animating Your Actio
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Chapter 14 ■ Setting Up the Game
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Chapter 15 Implementing Game Audio
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Chapter 15 ■ Implementing Game Au
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Chapter 16 ■ Collision Detection:
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Page 454 and 455: ■ index Background image (cont.)
Page 456 and 457: ■ index InvinciBagel animation (c
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Page 460 and 461: Beginning Java 8 Games Development
Page 462 and 463: This Java 8 Game Development book i
Page 464 and 465: ■ Contents NetBeans 8.0 Is User I
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■ Contents Creating a Hero Superc
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■ Contents Organizing the .update
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■ Contents Optimizing the Scene G
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About the Author Wallace Jackson ha
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Acknowledgments I would like to ack
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